Zenith Electronics Corporation

David B Danielson

Raymond G Capek

A process is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and tensed foil shadow mask. The process comprises providing a trough-like shadow mask support structure for receiving and securing the mask and filling the structure with a devitrifying solder glass paste of relatively low viscosity. The structure is then over-filled with devitrifying solder glass paste of relatively high viscosity. The structure is joined with the faceplate with the plate of relatively high viscosity in contact with the faceplate. The faceplate and the structure is heated to a temperature effective to shrink the solder glass paste into the structure and devitrify the paste to permanently secure the structure to the faceplate.

Process for an improved tension mask support structure

A faceplate assembly for a color cathode ray tube includes a glass faceplate having on its inner surface a centrally disposed phosphor screen. A metal foil shadow mask is mounted in tension on a mask support structure located on opposed sides of the screen and secured to the inner surface of the faceplate. The support structure according to the invention comprises a hollow shell filled with at least two devitrified solder glass compositions each having a different viscosity when in the form of an undevitrified solder glass paste. A process for manufacturing the inventive mask support structure is also provided.

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Elk Grove, IL, United States of America

David B Danielson